Zeiss MEL80
The ZEISS MEL 80 is a 193 nm argon-fluoride (ArF) excimer laser developed by Carl Zeiss Meditec for corneal refractive surgery, particularly LASIK. It uses a 250 Hz flying-spot laser with a small 0.7 mm Gaussian spot and a 250 Hz infrared eye tracker to monitor and compensate for eye movement during treatment.
The system incorporates galvanometric scanners, an infrared eye-tracking camera, operating microscope, debris-removal system (CCA+), laser optics and integrated control electronics.
Laser specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Carl Zeiss Meditec |
| Model | MEL 80 Excimer Laser System |
| Laser type | Argon-fluoride (ArF) excimer laser |
| Wavelength | 193 nm |
| Laser pulse duration | 4–7 ns |
| Repetition rate | 250 Hz |
| Spot size | 0.7 ± 0.1 mm FWHM diameter |
| Beam profile | Gaussian |
| Peak fluence at treatment area | >150 mJ/cm² |
| Beam delivery | Flying-spot / spot-scanning |
| Ablation mechanism | Photochemical corneal tissue ablation |
| Primary application | Corneal refractive surgery / LASIK |
Eye-tracking system
| Parameter | Specification |
|---|---|
| Eye tracker | Infrared (IR) eye tracker |
| Tracking frequency | 250 Hz |
| Tracking principle | Infrared imaging of the pupil |
| Function | Determines pupil centre and monitors eye movement during treatment |
| Integration | Integrated with the laser treatment system |
The eye tracker processes an IR image of the patient’s eye at 250 Hz, allowing the system to account for eye movement during the laser treatment.
Ablation/treatment specifications
| Parameter | Specification |
|---|---|
| Optical zone | 6.0–7.0 mm |
| Transition zone | 1.7–1.9 mm |
| Total ablation diameter | 7.7–8.9 mm |
| Myopia | ≤ −7.0 D |
| Astigmatism | ≤ −3.0 D |
| Maximum MRSE | −7.00 D |
Major system components
The MEL 80 incorporates:
- Excimer laser head
- Flying-spot scanning optics
- 250-Hz infrared eye tracker
- CCA+ controlled-atmosphere/debris-removal system
- Surgical microscope
- Motorised patient bed
- Patient headrest and positioning system
- Treatment-control computer
- OPASS software
- POLO laser-control software
- Integrated fixation illumination
- Laser safety/interlock systems
The CCA+ (Cone for Controlled Atmosphere) provides airflow around the treatment area to remove ablation debris from the laser beam path.
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